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"Plotting Point and Figure charts is like filling and emptying glasses of water. Imagine the boxes are straight-sided glass tumblers. When plotting a column of Xs, you are filling a glass and only once it is full do you plot the X, stack the full glass on top of the previous one and pick up an empty glass to start filling again. When plotting a column of Os you are emptying a glass and only when the glass is empty do you plot the 0, stack the empty glass and pick up a full one ready to start emptying it."